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The paper uses the reproductive effort model of Schaffer (1974) to provide conditions on the change in reproductive effort with age in evolutionarily stable life histories. It is shown that low adult mortality, continuing adult growth, a low rate of population increase, and a high sensitivity of survival and growth to reproduction all tend to favor increase in reproductive effort with age. Reproductive effort may decrease with age if the converse conditions hold.
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Charlesworth et al. (1976) studied this question.
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